Hardware: refers to gold, silver, copper, iron, tin, this commonly used metal or copper and iron and other products collectively.

"Ci Hai" contains:

Hardware: five metals. "Wu Yue Chunqiu" four "Lu": "Chen Wenchuan Wang Yuan often make the rule of five sub-sword, ... ... a Zhanlu, hardware of the British, the sun of the fine." Press "Han Food and Money" On the "gold, knives, turtles, shellfish" Note: "gold that the five colors of the gold, yellow said gold, white said silver, red said copper, green, said lead, black iron." Later, Silver, copper, iron, tin for the metal.

Hardware, refers to the gold, silver, copper, iron, tin, said five metal materials, hardware for the mother of industry; defense of the foundation, metal materials products, usually only divided into two major hardware and hardware categories. Large metal refers to steel, steel, flat iron, universal angle steel, channel iron, iron and various types of iron and steel materials, hardware, construction hardware, white iron, lock nails, wire, steel wire, wire cut, , Various tools and so on.